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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 124 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.12345679 × 81 =
  2. 2.594 + 495 =
  3. 3.1 + 2 + 3 + … + 52 =
  4. 4.12345679 × 45 =
  5. 5.245 × 10 =
  6. 6.1 + 3 + 5 + … + 27 =
  7. 7.Magic square (every row, column and diagonal has the same total): 4 18 8 | ? 10 6 | 12 2 16. What is the missing number?
  8. 8.9 × 2 =
  9. 9.9 × 3 =
  10. 10.2 × 100 =
  11. 11.31 × 4 =
  12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  13. 13.1 + 3 + 5 + … + 39 =
  14. 14.58 × 4 =
  15. 15.12 × 9 + 3 =
  16. 16.?263 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.1 + 2 + 3 + … + 36 =
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  19. 19.9 × 10 = 9? — what is the missing digit?
  20. 20.44 × ? = 4400
  21. 21.1 + 2 + 3 + … + 18 =
  22. 22.If today is Friday, what day was it 33 days ago? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  23. 23.5?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.14 × 4 =
  25. 25.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  26. 26.Do the 1089 trick with 893: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.1 + 2 + 3 + … + 73 =
  28. 28.In 6 years a boy will be 14 years old. How old was he 5 years ago?
  29. 29.792 + 297 =
  30. 30.What comes next? 11, 15, 19, 23, ? (a) 28 (b) 23 (c) 27 (d) 31
  31. 31.9 × 9 =
  32. 32.16 × 4 =
  33. 33.A father is 45 years old and his son is 13. How old was the father when the son was born?
  34. 34.Double 17 =
  35. 35.?926 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.3 × ? = 3000
  37. 37.I thought of a number, multiplied it by 3 and added 1. I got 19. What was my number?
  38. 38.7 × 4 =
  39. 39.1 + 2 + 3 + … + 15 =
  40. 40.I thought of a number, multiplied it by 4 and added 9. I got 21. What was my number?

Answer key

  1. 999999999
  2. 1089
  3. 1378
  4. 555555555
  5. 2450
  6. 196
  7. 14
  8. 18
  9. 27
  10. 200
  11. 124
  12. 891
  13. 400
  14. 232
  15. 111
  16. 7
  17. 666
  18. 297
  19. 0
  20. 100
  21. 171
  22. Sunday
  23. 3
  24. 56
  25. 1
  26. 1089
  27. 2701
  28. 3
  29. 1089
  30. 27
  31. 81
  32. 64
  33. 32
  34. 34
  35. 1
  36. 1000
  37. 6
  38. 28
  39. 120
  40. 3

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